Empty sample project taking almost 3 GB of memory in DX12

[Alekssasho]

When creating new Device you create a QueryHeap for the GPUTimers with very large count of 128 * 1024 * 1024.
This is happening on this line https://github.com/NVIDIAGameWorks/Falcor/blob/master/Framework/Source/API/Device.cpp#L84.
This is allocating enormous amount of memory.

This seems unnecessary large and should be either lowered or made a constant that can be user changed for example in Device::Desc

[nbentyNV]

I assume you're running Vulkan. The DX12 backend only consumes 130MB.
Just read the title. Weird, I'm seeing 130MB. What GPU are you using?

We will fix it for the next release - add options to control the number of GPU queries and the sizes of the descriptor heaps.

[Alekssasho]

Actually it is both Dx12 and Vulkan. The number you are passing is the count of slots, but every query slot is taking more than 1 byte, so is both Vulkan and Dx12 this is a lot more than 128 MB.

[nbentyNV]

I changed the number to 50000. I'm replacing this issue with #69